The flooding situation in southern British Columbia grew more miserable Monday as the skies opened up yet again. Forecasters say the hardest hit communities can expect a lot more rain in the days to come.

The torrential rain, the heaviest in 100 years, has already claimed two lives while two others were still missing. About 800 people have been forced to flee their homes.

Two emergency operation centres have been established: one in Squamish and the other in Pemberton.

Squamish Mayor Ian Sutherland told a news conference Monday the town was expecting more rain.

"We can't do anything about more rain coming down, but we are planning for it because we know there's a lot of rain coming," Sutherland said.

Another 40 millimetres were expected to fall on the area over the next two days. That's after Squamish endured record-breaking downpours Friday and Saturday that totalled 400 millimetres -- the amount of rain that usually falls in all of October.

Pemberton, about a two-hour drive north of Squamish on the other side of Whistler, got less rain Monday but was more badly damaged. Residents were working around the clock to stabilize dykes as the thunder rolled.

A huge helicopter had taken two containers with about 1,000 kilograms of dairy and non-perishable products to Pemberton, Shane Mills of the Provincial Emergency Program said.

The highway north and south of the town has been washed away, leaving the residents marooned. At about mid-day, the Highways Ministry finally got a chance to look at the damage. Ministry spokesman Jeff Knight said crews discovered about 300 metres of road were gone.

Officials say it could be at least Tuesday before a temporary bridge is installed over the creek that washed away between Pemberton and Whistler.

Kevin Martindale, who has lived in the Pemberton area for 12 years but was experiencing his first flood, put the blame on Mother Nature.

"This is just an act of nature. The Pemberton Valley is noted for flooding," he said.

The deaths and missing persons resulted from two vehicles being swallowed by a raging creek that had washed out a bridge between the resort community of Whistler and Pemberton.

Pemberton RCMP Const. Michelle Friesen said a sports utility vehicle carrying three people was swept away. One person swam to safety and two others were missing. A jeep was also engulfed and two bodies were recovered.

The names of the dead and missing are being released pending notification of next of kin, Friesen said.

With reports from CTV News and The Canadian Press